package com.frame.common.security;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

import com.frame.common.VelocityCaller;

public class MySecurityFilter extends AbstractSecurityInterceptor implements Filter {
	// 与applicationContext-security.xml里的myFilter的属性securityMetadataSource对应，
	// 其他的两个组件，已经在AbstractSecurityInterceptor定义
	private FilterInvocationSecurityMetadataSource securityMetadataSource;
	
	@Autowired
	private VelocityCaller velocityCaller;

	@Override
	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return this.securityMetadataSource;
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation(request, response, chain);
		invoke(fi);
	}

	private void invoke(FilterInvocation fi) throws IOException,ServletException {
		 System.out.println("MySecurityFilter.invoke");
		// object为FilterInvocation对象
		// super.beforeInvocation(fi);//源码
		// 1.获取请求资源的权限
		 //执行 Collection<ConfigAttribute> attributes = securityMetadataSource.getAttributes(fi);
		// 2.是否拥有权限
		// this.accessDecisionManager.decide(authenticated, fi, attributes);
		// this.accessDecisionManager.decide(authenticated, fi, attributes);
		InterceptorStatusToken token = super.beforeInvocation(fi);
		try {
			fi.getRequest().setAttribute("velocityCaller", velocityCaller);
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		}
//		catch (Exception e) {
//			super.afterInvocation(token, null);
//			e.printStackTrace();
//		} 
		finally {
			super.afterInvocation(token, null);
		}
	}

	public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
		return securityMetadataSource;
	}

	public void setSecurityMetadataSource(
			FilterInvocationSecurityMetadataSource securityMetadataSource) {
		this.securityMetadataSource = securityMetadataSource;
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
	}

	public void destroy() {
		// TODO Auto-generated method stub

	}

	@Override
	public Class<? extends Object> getSecureObjectClass() {
		//下面的MyAccessDecisionManager的supports方面必须放回true,否则会提醒类型错误  
		return FilterInvocation.class;
	}
	
	
}